Book Maths Puzzle Algebra

A wild birdseed mix is made by combining 100lb. of millet seed costing $0.60 per lb. with sunflower seeds costing $1.10 per pound. How many pounds of sunflower seeds are needed to make a mixture that costs $0.70 per lb?

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Book Other Question

A nurse must add a 5% solution to 750 ml of a 30% to produce a 20% solution. How much of the 5% solution must be added? The Comfort suite offers rooms to groups of sales representatives for $65 per person. The Holiday Inn offers rooms to groups of representatives for $2,500 plus $40 for each representative over the first 30 who attend. For what size group of sales representatives will the Holiday Inn cost less than the Comfort suite?